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Bosch · Fault Codes

Bosch Error Codes Explained

Bosch dishwashers display clear E-codes that make diagnosis efficient. Here is what the most common ones, E15, E24, E22, E09, and E18, actually mean, which you can often clear yourself, and which need a technician.

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Reading a Bosch E-Code

Bosch dishwashers show an E followed by a number, and the number maps to a functional area such as leaks, drainage, or heating. That structure is why Bosch is one of the easier premium dishwashers to diagnose. A code narrows the field but does not name the exact part: a drainage code, for instance, could be a clogged filter or a failed pump. The code plus a hands-on test is what leads to the right repair, and on our hard Front Range water, scale is often lurking behind the drainage and heating codes.

The Codes You Will See Most

Code	Meaning	What We Check
E15	AquaStop sensed water in base pan	Leak source, hoses, seals, fittings
E24	Drainage fault, will not pump out	Filter, drain hose, drain pump
E22	Filter or drainage circulation fault	Filter, sump, drain path
E09	Flow-through heating element fault	Heater, wiring, control
E18	Water flow or circulation fault	Inlet, flow meter, circulation pump

The pattern is consistent: E15 is about leaks, E24 and E22 about drainage and the filter, E09 about heating, and E18 about water flow. Because so many of these tie back to scale and debris, keeping the filter clean and the softener salt topped up prevents a real share of the codes before they appear.

Clear the Drainage Codes First, Act on E15 Right Away

For E24 or E22, cleaning the filter and drain path and running a fresh cycle clears the fault surprisingly often. E15 is different: it means water has reached the base pan, so drain the pan but do not just keep resetting it. A returning E15 is an active leak and needs to be traced by a technician.

Seeing a Bosch E-Code?

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Frequently Asked Questions

What Does E15 Mean on a Bosch Dishwasher?

E15 means the AquaStop anti-flood system has detected water in the base pan. Tipping the unit back to drain the pan sometimes clears a one-time spill, but if E15 returns there is an active leak. The source, a hose, seal, or fitting, needs to be found and repaired before more water collects.

How Do I Fix E24 on a Bosch Dishwasher?

E24 is a drainage fault. Clean the filter at the bottom of the tub, check the drain hose for a kink, and make sure the air gap or disposer connection is clear. Run a rinse cycle. If E24 comes back, the drain pump or check valve likely needs service rather than another cleaning.

What Is E09 on a Bosch Dishwasher?

E09 points to the flow-through heating element, which warms the wash and rinse water. When it fails, dishes come out cool and poorly cleaned or dried. On our hard water, scale on the heater is a common contributor. E09 generally means the heating circuit needs a technician to test and replace parts.

Book a Sub-Zero or Wolf Technician in Castle Rock

Reserve a visit online or call and we will confirm the next available window. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.